3 Answers
3

You should try downloading and testing with either ubuntu 12.04 or 12.10. Every new version fixes bugs and problems, so it is quite likely that the problem you've run into is fixed in a newer version of Ubuntu.

Try ubuntu 12.04 LTS If you are looking for long-term support (for servers, corporate environment, etc), or ubuntu 12.10 if you are looking for a more up-to-date version going forward.

If you just want test the Ubuntu in LiveCD, try this:
Burn another disc or switch the cd reader device of your computer. Some cd readers maybe don't work for that test.
I already see this bug in my pc. That's work for my case.